01 - Preheat the oven to 425°F. Prepare two baking sheets with parchment paper or grease lightly.
02 - Peel the onions and slice into ½-inch thick rings. Separate rings and set aside.
03 - Combine flour, salt, black pepper, and smoked paprika in a shallow bowl and mix thoroughly.
04 - Whisk eggs and milk together in a separate bowl until smooth.
05 - Toss panko breadcrumbs with olive oil in another bowl until evenly coated.
06 - Dredge each onion ring in the flour mixture, dip into the egg wash, then coat with the oiled panko breadcrumbs, pressing gently to adhere.
07 - Place coated onion rings in a single layer on the prepared baking sheets.
08 - Bake for 18 to 20 minutes at 425°F, flipping the rings halfway through, until golden and crisp.
09 - Serve hot with your preferred dipping sauce.